Fruit‐bearing branchlets are carbon autonomous in mature broad‐leaved temperate forest trees
Fruit‐bearing branchlets are carbon autonomous in mature broad‐leaved temperate forest trees
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成熟温带阔叶林树的结果枝具有碳自主性
DOI：
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发表时间：
2005
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影响因子：
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通讯作者：
G. Hoch
中科院分区：
文献类型：
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作者：
G. Hoch
为了评价果实发育的碳自主程度，对成熟落叶乔木果实小枝的碳源库关系进行了原位调控。试验包括半落叶、全落叶、环落叶或两种处理的组合，分别用冠层起重机对结果枝进行处理。分析了不同枝条组织和果实中非结构性碳水化合物（NSC）的浓度，以确定不同处理引起的碳失衡情况。不同处理下小枝NSC浓度普遍较低，导致果实生长下降。在未受干扰的完整小枝水平上，所有3个被调查物种（柏树、森林Fagus和白木椴）均表现出完全的结果碳自主性，因为在环状、未脱落的小枝上，总果序生物量和单果质量都没有减少。在100%剥落的环状小枝上，果实生物量相对于对照减少了约50%，而在Fagus中则减少了近80%，这可以解释为不同物种间光合作用活跃的果序组织比例不同。与其他两种植物相比，椴的小枝不需要输入碳来补偿落叶后同化物的损失。
In order to evaluate the degree of carbon autonomy for fruit development, the carbon source-sink relationship in fruit-bearing branchlets of mature deciduous forest trees was manipulated in situ. The tests included half and complete defoliation, girdling or the combination of both treatments, which were applied on fruiting branchlets by using a canopy crane. Concentrations of non-structural carbohydrates (NSC) were analysed in different branchlet tissues and fruits, to identify situations of carbon imbalances induced by the treatments. NSC concentrations of branchlets were generally lower under treatments resulting in decreased fruit growth. All three investigated species (Carpinus betulus, Fagus sylvatica and Tilia platyphyllos) exhibited complete carbon autonomy of fruiting at the level of whole, undisturbed branchlets, since neither a decrease of total infructescence biomass, nor of individual fruit mass occurred on girdled, un-defoliated branchlets. On girdled, 100% defoliated branchlets, fruit biomass relative to controls decreased by approximately 50% in Carpinus and Tilia, but by almost 80% in Fagus, which can be explained by different proportions of photosynthetically active infructescence tissues among the species. In contrast to the other two species, Tilia branchlets did not import carbon to compensate for assimilate loss after defoliation.